William Carl Mackenzie , PA-C
Physician Assistant โข Winter Garden, FL
2200 Fowler Grove Blvd Ste 360
Winter Garden, FL 347875597
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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William Mackenzie is listed in NPPES under Physician Assistant.
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NPI assigned on June 24, 2019; this date does not establish years in practice.
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Published CMS data list 12 Original Medicare Part B services in 2023.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2023. Published rows only; this is not a quality measure.
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Published Part B service records, 2023:
- 99232 โ Subsequent hospital care with moderate levelof medical decision making: 12 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2023. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2022 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2023). CPT notice
See the full table ยท Guide: How to read Medicare Part B data
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Medicare Part B services went from 14 in 2021 to 12 in 2023.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021โ2023.
Practice Location & Contact Primary Location
2200 Fowler Grove Blvd Ste 360
Winter Garden, FL 347875597
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 5 distinct additional practice-address records in Clermont, FL; Davenport, FL; Lake Mary, FL and 1 more. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 3 distinct group names: Ability Health Services And Rehabilitation Lp; Ability Health Services, Inc; Florida Hospital Medical Group Inc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2019
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $801 in 2023
The total amount Medicare approved for these services in 2023. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2023.
Paid by Medicare
About $639 in 2023
The part of the Medicare-allowed amount that Medicare itself paid in 2023, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2023.
Open Payments general payments, program year 2025
All general payments: $120.85 across 2 records.
By nature of payment
- Food and Beverage: $120.85 across 2 records.
Reporting-company totals
- ZOLL Services LLC (A/K/A ZOLL LifeCor Corp): $120.85 across 2 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
7 years (graduated 2019)
CMS Doctors and Clinicians data list 2019 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2019
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
William Mackenzie has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists William Mackenzie as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Winter Garden and Florida
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for William Mackenzie are from 2023.
27 active clinicians are listed under Physician Assistant with a practice address in Winter Garden, FL (10,260 in Florida).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Winter Garden
18.5% of these 27 clinicians have the CMS telehealth indicator.
66.7% of these 27 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services went from 14 in 2021 to 12 in 2023.
- 2021: 14
- 2023: 12
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Medicare-allowed amount
Medicare-allowed amount went from $859 in 2021 to $801 in 2023.
- 2021: $859
- 2023: $801
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Paid by Medicare
Paid by Medicare went from $699 in 2021 to $639 in 2023.
- 2021: $699
- 2023: $639
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $320.75 in 2022 to $120.85 in 2025.
- 2022: $320.75
- 2023: $61.45
- 2025: $120.85
Sources: CMS Medicare Physician & Other Practitioners (2023), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 โ December 31, 2025): fewer than 11 records totaling $120.85.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) |
Food and Beverage
Cash or cash equivalent
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LifeVest | General | $115.15 |
| ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) |
Food and Beverage
Cash or cash equivalent
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LifeVest | General | $5.70 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2020โ2022 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2021โ2023; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
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12 | 11 | $230.50 | $66.78 |
Source: CMS Part B by Provider and Service, 2023; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-06-18NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
NUCC Taxonomy Code: 363AS0400X
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20191115000438
FL
1557793494
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Florida Hospital Medical Group Inc
2600 Westhall Ln, Maitland, FL 327517102
Phone: 4072002700
Ability Health Services, Inc
1200 Lexington Green Ln, Sanford, FL 327711013
Florida Hospital Medical Group Inc
2000 Fowler Grove Blvd, Winter Garden, FL 347875050
Ability Health Services And Rehabilitation Lp
1200 Lexington Green Ln, Sanford, FL 327711013
Florida Hospital Medical Group Inc
601 E Rollins St, Orlando, FL 328031248
Phone: 4073032570
Florida Hospital Medical Group Inc
2200 Fowler Grove Blvd, Winter Garden, FL 347875597
Secondary Practice Locations
1141 Patterson Ter
Lake Mary, FL 327462203
Phone: 8444074070
25 S Terry Ave
Orlando, FL 328051843
Phone: 8444074070
265 E Rollins St Ste 111000
Orlando, FL 328045502
Phone: 8444074070
1919 E Highway 50
Clermont, FL 347111975
Phone: 8444074070
410 Lionel Way Ste 201
Davenport, FL 338377809
Phone: 8444074070
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Orthopaedic Surgery - Sports Medicine
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant (Certified)
Orthopaedic Surgery - Hand Surgery
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Physician Assistant
Registered at 2200 FOWLER GROVE BLVD STE 360, WINTER GARDEN, FL 347875597 (Tel: 8444074070)
Registered at 2200 FOWLER GROVE BLVD STE 360, WINTER GARDEN, FL 347875597 (Tel: 8444074070)
Recorded as WILLIAM MACKENZIE, PA-C
Physician Assistant (license number reported to NPPES: FL PA9112545)
Registered at 1613 N MILLS AVE, ORLANDO, FL 328031849 (Tel: 4078944474)
Registered at 1613 N MILLS AVE, ORLANDO, FL 328031849 (Tel: 4078944474)
Registered at 100 ESLINGER WAY, SANFORD, FL 327736706 (Tel: 4074519455)
Physician Assistant
Registered at 720 W OAK ST STE 303, KISSIMMEE, FL 347414992 (Tel: 9172261619)
Physician Assistant (license number reported to NPPES: FL 9112545)
Registered at 3189 LAKE GEORGE COVE DR, ORLANDO, FL 328126822 (Tel: 4074519455)
Registered at 3189 LAKE GEORGE COVE DR, ORLANDO, FL 328126822
Physician Assistant
Registered at 1335 SLIGH BLVD., SUITE 200, ORLANDO, FL 32806 (Tel: 4076496884)
Registered at 1335 SLIGH BLVD., SUITE 200, ORLANDO, FL 32806 (Tel: 4076496884)
Physician Assistant (license number reported to NPPES: FL PA9112545)
Registered at 7236 STONEROCK CIR, ORLANDO, FL 328198000 (Tel: 3218416444)
Registered at 7236 STONEROCK CIR, ORLANDO, FL 328198000 (Tel: 3218416444)
Physician Assistant
Registered at 601 E ROLLINS ST, ORLANDO, FL 328031248 (Tel: 4074519455)
Registered at 1308 S SUMMERLIN AVE, ORLANDO, FL 328062248 (Tel: 4074519455)
NPI status registered as active in NPPES database
Registered at 3301 COLLEGE AVE, DAVIE, FL 333147796 (Tel: 9542621288)
Registered at 3200 S UNIVERSITY DR, DAVIE, FL 333282018 (Tel: 9542621288)
Recorded as WILLIAM MACKENZIE
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Winter Garden
- Alan Stuart
- Vlad Richko, MMS, PA-C
- Laura Mendoza, PA-C
- Shannon Delong, PA-C
- Melissa Wilkes
- Christine Allen, PA-C
Mailing Address
2200 Fowler Grove Blvd Ste 360
Winter Garden, FL 347875597
Phone: 8444074070